Is there any direct formula for the no. of optical isomers in a coordination compound

There is no direct formula. Follow these logics
• Nonñidentical mirror images with the same geometric arrangement of ligands
•
A set of two isomers are called enantiomers
•
Enantiomers differ in optical properties ññ rotate planeñpolarized light in opposite
directions

Optical isomers are mirror images of one another that cannot be superimposed.
•
Check for optical isomers by checking superpositions of mirror images (rotate to
superimpose)